<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 提示 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      ></el-alert>

      <!-- 步骤条 -->
      <el-steps :active="activeIndex-0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" tab-position="left" style="margin-top:15px" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane name="0" label="基本信息">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{ 
                  expandTrigger: 'hover',
                  label: 'cat_name',
                  value: 'cat_id',
                  children: 'children'
                  }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
            
          </el-tab-pane>
          <el-tab-pane name="1" label="商品参数">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="(item) in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="item2" v-for="(item2,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane name="2" label="商品属性">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane name="3" label="商品图片">
            <!-- action表示图片要上传到的api地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane name="4" label="商品内容">
            <!-- 富文本编辑器组件 -->
            <quill-editor
              v-model="addForm.goods_introduce"
            />
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="addBtn" @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
      
    </el-card>


    <!-- ***********************************对话框********************************** -->
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%"
      >
      <img :src="previewPath" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  name: "Add",
  data() {
    return {
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm:{
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //图片数组
        pics:[],
        //商品的详情描述
        goods_introduce: '',
        //动态参数和静态属性
        attrs:[]
      },
      //添加商品表单的校验规则
      addFormRules:{
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price:[
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight:[
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number:[
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat:[
          { required: true, message: "请选择商品分类", trigger: "blur" },
        ]

      },
      //商品分类数据
      cateList:[],
      //动态参数列表数据
      manyTableData: [],
      //静态属性列表数据
      onlyTableData: [],
      //上传图片的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的请求头对象
      headersObj:{
        Authorization: sessionStorage.getItem('token'),
      },
      previewPath: '',
      //显示或隐藏图片预览对话框
      previewVisible: false
    };
  },
  created() {
    this.getCateList();
  },
  computed: {
    //三级分类Id
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null;
    }
  	
  },
  methods: {
    //获取所有商品分类数据
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
      this.cateList = res.data;
    },
    //级联选择器选中项变化会触发该函数
    handleChange(){
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
      
    },
    // 切换标签之前的钩子
    beforeTabLeave(activeName,oldActiveName){
      if(this.addForm.goods_cat.length !== 3 && this.activeIndex === '0'){
        this.$message.error('请先选择商品分类')
        return false;
      }
      return true;
    },
    //tab 被选中时触发
    async tabClicked(){
      //证明访问的是动态参数面板
      if(this.activeIndex === '1'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel: 'many'}})
        if(res.meta.status !== 200) return this.$message.error('获取动态参数失败')
        res.data.forEach(item=>{
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data;
      }
      //证明访问的是静态属性面板
      else if(this.activeIndex === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel: 'only'}})
        if(res.meta.status !== 200) return this.$message.error('获取静态参数失败')
        this.onlyTableData = res.data;
      }
    },
    //处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file){
      //获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      //从pics中找到
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      //移除
      this.addForm.pics.splice(i,1)
    },
    //监听图片上传成功
    handleSuccess(res){
      const picInfo = {
        pic: res.data.tmp_path
      }
      this.addForm.pics.push(picInfo)
    },
    //添加商品
    async addGoods(){
      this.$refs.addFormRef.validate(valid=>{
        if(!valid) return this.$message.error('请填写必要的表单项！')
      })
      //数据处理
      //用深拷贝拷贝出一个addForm的复制
      const form = _.cloneDeep(this.addForm)
      //处理商品分类
      form.goods_cat = form.goods_cat.join(',')
      //动态参数
      this.manyTableData.forEach(item=>{
        const newInfo = {
          attr_id: item.attr_id,
          attr_vals: item.attr_vals.join(' ')
        }
        form.attrs.push(newInfo)
      })
      // 静态属性
      this.onlyTableData.forEach(item=>{
        const newInfo = {
          attr_id: item.attr_id,
          attr_vals: item.attr_vals
        }
        form.attrs.push(newInfo)
      })  

      //发起请求添加商品
      //商品名称，必须是唯一的
      const {data:res} = await this.$http.post('goods',form)
      if(res.meta.status !== 201) return this.$message.error('添加商品失败')
      //跳转到商品列表
      this.$router.push('/goods')
    }
  }
};
</script>

<style lang="less" scoped>
.el-steps {
  margin-top: 15px;
}

.el-step_title {
  font-size: 13px;
}

.el-checkbox{
  margin: 0 10px 0 0 !important;
}

.previewImg{
  width: 100%;
}

.addBtn{
  margin-top: 15px;
}
</style>